WhereAVR – The Genuine APRS Tracker

Have you noticed that Atmel AVRs have slowly dominated the world? Have a closer and detailed look over the electronic projects on the websites, you’ll find out that over 70 percent of the projects are mainly related with Arduino, Atmel AVR or LED stuffs! Honestly, if you’re having the interest on building an AVR related project, then you’ve came to the right place! Today, you’re going to develop a small, lightweight with low-power consumption, WhereAVR. Ok, you must be wondered, “What the heck of this WhereAVR?” Well, to be honest, it’s a low-cost APRS tracker equipped with a full complement of analog and digital I/O. Talking about APRS, it’s a short acronym, which is mean for “Automatic Packet Reporting System”. Basically, APRS is an amateur radio based system for real-time tactical digital communications of information of immediate value in the local area. The main purpose of APRS is collecting all data, then it will be ingested into the APRS internet system and finally, it distributes the data globally for instant access. By the way, this WhereAVR also has the ability‚Ķ Continue reading

WhereAVR – lightweight APRS tracker

This small AVR based APRS tracker is designed to be used in balloon. Tracker can be interfaced with GPS receiver; also it has several analog and digital I/O where various sensors can be attached. WhereAVR has ability to decode ax.25 packets, what allows reception of remote commands like real TNC does. Board itself is built around ATmega8 microcontroller which has all necessary functions built in. Tracker is able to generate 1200-baud audio signal which is used to modulate carrier radio signal. I also have a zero-crossing audio signal detector. And of course what tracker would be without GPS module. Module was put on a test where balloon flew above 90000ft. It worked fine … but its gone somewhere over Atlantic. Nice project to learn from. Author provides all necessary files in case you want to repeat his experiment. Continue reading